US 11,728,696 B2
Lamination stack for use in an electrical machine
Erwan Salahun, Groix (FR); Joaquim Da Silva, Sennely (FR); and Bruno Tellier, Saint-Julien-de-la Liegue (FR)
Assigned to SKF MAGNETIC MECHATRONICS, Saint-Marcel (FR)
Filed by SKF MAGNETIC MECHATRONICS, Saint-Marcel (FR)
Filed on Dec. 14, 2020, as Appl. No. 17/121,148.
Application 17/121,148 is a division of application No. 15/597,275, filed on May 17, 2017, granted, now 10,897,164.
Claims priority of application No. 102016208744.4 (DE), filed on May 20, 2016.
Prior Publication US 2021/0099032 A1, Apr. 1, 2021
Int. Cl. H02K 1/02 (2006.01); H02K 7/09 (2006.01); H02K 15/02 (2006.01); H02K 1/17 (2006.01); H02K 1/27 (2022.01)
CPC H02K 1/02 (2013.01) [H02K 7/09 (2013.01); H02K 15/02 (2013.01); H02K 1/17 (2013.01); H02K 1/27 (2013.01); H02K 2201/09 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A lamination stack for use in a rotating electrical machine, the lamination stack being formed by a method comprising:
providing a plurality of sheets of ferritic material, each of the sheets having a first side and a second side and a thickness from the first side to the second side, the first and second sides having asperities each having a height of about two microns;
coating at least one side of each sheet with a chemically protective electrically insulating material;
stacking the coated sheets;
compressing the stack of the coated sheets;
heating the compressed stack of coated sheets at a temperature above a melting temperature of the insulating material; and
cooling the compressed stack.